Stack divider



FIG. 1 is a top-left perspective view of a stack divider showing our new design folded around a stack which is shown in phantom lines;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a front view thereof;

FIG. 7 is a rear view thereof; and,

FIG. 8 is a top view thereof in a flat position.

The portions shown in phantom lines including the stack and the the embossment are not part of the claimed invention, but are included to show environment. 

The ornamental design for a stack divider, as shown and described. 